remove rem overlay

[simeonschaub]

remainder has different semantics than rem

Fixes #374

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.01%. Comparing base (a6f878a) to head (6ccf2e9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #386   +/-   ##
=======================================
  Coverage   79.01%   79.01%           
=======================================
  Files          12       12           
  Lines         672      672           
=======================================
  Hits          531      531           
  Misses        141      141           

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[simeonschaub]

merged as part of #368